Exam-style question
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Which observation from cathode ray experiments directly led to the identification of the electron?.
- A.The rays produced light when striking glass.
- B.The rays could be deflected by magnetic fields.
- C.The rays caused a paddle wheel to rotate.
- D.The rays could pass through thin metal foils.
Model answer
What a good answer should say
- The rays could be deflected by magnetic fields.
Explanation
Why this works
The evidence that cathode rays could be deflected by magnetic fields shows that they possess charge and mass. This implies that they are particles, leading to the conclusion that these particles are electrons, which were identified through such experimental observations.
Common mistake
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